Friction draft-gear.



E. W. NEWELL.

FRICTION DRAFT GEAR.

APPLICATION HLED SEPT. 2, I9I5.

Patented Oct. 15, 1918.

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E W. NEWELL.

FRICHON DRAFT GEAR.

APPLICATION FILED SEPT. 2. I915.

Patented (M15, 1918.

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EDWARD W. NEWELL, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO THE WESTING- HOUSE AIR BRAKE COMPANY, OF W'ILIVIERDING, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

FRICTION DRAFEBGEAR.

Application filed September 2, 1915.

To all whom it may concern:

Be it known that I, EDWARD W. NEWELL, a citizen of the United States, residing at Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented new and useful Improvements in Friction Draft- Gears, of which the following is a specification.

My invention relates to friction draftgear as employed on railway cars for taking up bufling and draft stresses.

One object of my invention is to provide an improved friction draft gear in which the draft springs may be easily inspected and when necessary may be removed with facility without disturbing the other parts of the gear.

Another object is to provide a friction draft gear having extended friction faces adapted to prevent tipping of the parts when under stress.

Another object of the invention is to provide'improved means for placing the draft springs under initial compression.

Other objects and advantages will appear in the following more detailed description of the invention.

In the accompanying drawings; Figure 1 is a vertical longitudinal section of a friction draft gear embodying my improvements; Fig. 2 a horizontal longitudinal section thereof; Fig. 3 a transverse section on the line aa of Fig. 1; Fig. 4 a transverse section on the line 6 of Fig.1; Fig. 5 a

side elevation of the friction draft gear; Fig. 6 aside elevation of one of thedraft gear links; and Fig. 7 a plan view thereof.

According to my invention, the draft gear may comprise friction elements mounted between the usual car center sills 1 and preferably operatively connected to the draw bar 2 by means of akey 3 and links 4.

There is provideda frontfriction element 5 having oppositely inclined friction faces 6 and 7 and bearing at the front end against the end of the draw-bar 2, a rear friction element 8 having oppositely inclined friction faces 9 and 10 and adapted to engage a stop casting 11 at the rear end, which may be the bolster centerplate or a separate castmg V Specification of Letters Patent.

Patented Oct. 15, 1918.

Serial No. 48,642.

Between the front and rear friction elements 5 and 8 is mounted a spring casing 12 having front and rear friction faces adapted to engage the respective friction faces 6 and 9 of the front and rear friction elements 5 and 8. At the front and rear of the casing 12 are mounted wedge blocks 13 having friction faces adapted to engage the friction faces 7 and 10 of the elements 5 and 8 and vertical friction faces adapted to cooperate with corresponding faces 1d of the casing 12.

Within the casing 12 are mounted preferably two sets of draft springs 15 and 16 which are adapted to resist relative lateral movement between the wedge blocks 13 and the casing 12, this being accomplished by providing U bolts 17, the legs of which eX- tend through holes in the wedge blocks, and a spring plate 18 which is held against the lower ends of the draft springs by nuts 19 applied to the bolts 17.

As shown more clearly in Fig. 5 of the drawings, the front friction element 5 is provided with side flanges 20, so that the friction face 6 may be extended to bear against corresponding friction faces provided on the casing 12 and thus prevent any tendency of the parts to tip when subjected to stress, and for a similar purpose, the links 4 are provided with side flanges 21 having inclined friction faces adapted to bear against corresponding friction faces of the casing 12.

At the rear ends of the links f and facing inwardly are half round bosses 22 which are adapted to engage corresponding recesses formed in the rear friction element 8, this construction permitting vertical play so as to allow the parts to automatically adjust themselves in case the alinement is inaccurate.

Adjacent to the U bolts 17 the front friction element 5 and the rear friction element 8 may be provided with grooves 23 and 24L respectively, so as to permit free movement of the bolts, if there is any tendency of the parts to work out of their normal operating positions.

While any desired draft gear attachment may be employed, I have shown a stationary key 25 which acts as a front and rear folsince the rear friction element 8 is held 1 against movement by the engagement of the links 4 against the stationary key 25, the wedge blocks 13 will be forced laterally upward and the casing 12 downwardly against the resistance of the draft springs, frictional resistance being set up by the movement of the wedge blocks 13 on the friction faces 7 10, and 14, and the casing 12 on the friction faces 6 and 9.

The friction faces 6 being. extendedby the addition of the side flanges20, and similar extended friction faces being provided by the flanges 21 of the links 4, any tendency of the parts to tip is prevented. i 7

Under a draft stress, the forward movement of the front friction element 5 is prevented by engagement with the key 25, so

f that asthe' links 4' are pulled forward by the draw'-bar,the rear friction element 8 moves toward the front so that the wedge blocks 13 and the casing 12 are spread apart against 7 the resisting force of the draft springs, the several friction faces engaging as under a bufiing stress. 7

Having now described my invention, what I claim as new and desire to secureby Letlters Patent, is j r 1. In a friction draft: gear, the combination with a draw-bar, of a front friction element having oppositely inclined friction faces, a rear friction element having oppositely inclined friction faces, a casing having friction faces adapted to engage friction faces of the frontand rear friction elements and also being provided with other friction faces,.wedge blocks having friction faces engaging the other friction faces of the friction elements and the other friction faces on the casing, draft springs mounted "in said casing, and tie rods connected to the wedge blocks and extending through the casing for transmitting the resistance of the springs to the wedge blocks to thereby oppose spreading movement between the casing" and the wedge blocks; a V V V 2. In a friction draft: gear, the combination with a draw-bar, of a front friction element having oppositely inclined friction faces, a rear friction element having oppositely inclined friction faces, a casinghaving friction faces adapted to engage friction faces ofthe front and rear friction elements, and also being provided with other friction faces, wedge blocks having friction faces engaging the other friction faces of the friction elements and the other friction faces on the casing, draft springs mounted in said casing, a spring plate for confining the springs within the'casing, and tie bolts extending through the casing for connecting the spring plate to the wedge blocks.

3. In a friction draft gear, the combina-V tion with a draw-bar, of a front friction element having oppositely inclined. friction faces, a rear friction element having oppositely inclined friction faces, a casing having oppositely inclined friction faces adapted to engage corresponding friction faces of the front and rear friction elements, wedge blocks having friction faces for engaging the other friction faces of the friction elements," draft springs for resisting V spreading movement between the wedge blocks and the casing, the front friction element having side members for extending one friction face across the other. a

4. In a friction draft gear, the combination with a draw-bar, of a front friction element having oppositely inclined friction faces, a rear friction elementhaving oppositely inclined friction faces, a casing having Ioppositely inclined friction faces adapted to engage corresponding friction faces of the front and rear friction elements, wedge blocks having friction faces for engaging the other friction faces of the friction elements, draft springs for resisting spreading movement between the wedge blocks-and the casing, thefront friction element being provided with side flanges on which'one friction face is extended for engagement with corresponding faces of the casing.

' 5. In a friction draft gear, the combination with a draw-bar, of a front friction element having oppositely] inclined friction V faces, a rear friction element having oppositely inclined friction faces, links for "connecting the rear friction element to the draw-bar, a casing having oppositely inclined'friction faces for jengaglng corresponding friction faces of the front and rear friction elements, wedge blocks having friction faces for engaging the other fric- .tion faces of the friction elements, draft springs for opposing the spreading movement of the wedge blocks and the casing,

ing.

tion with a draw-bar, of a front friction,

"said links being provided with friction faces for engaging friction faceson the we 7 r element having oppositely inclined friction faces, a rear friction element having oppositely inclined friction faces, links for connecting the rear friction element to the draw-bar, a casing having oppositely in-.

clined friction faces fo g g g rresponding friction faces of the front and rear friction elements, Wedge blocks having friction faces for engaging the other friction faces of the friction elements, draft springs for opposing the spreading movement of the Wedge blocks and the casing, the front friction element having side flanges with friction faces adapted to engage friction faces of the casing and the links being provided with friction faces for 10 engaging corresponding friction faces of the casing.

In testimony whereof I have hereunto set my hand.

EDWARD W. NEWELL. Witnesses:

A. M. GLEMENTs, BARBARA HERBERT.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Iatenta, Washington, I). G. 

